This Wasm interpreter fits in a QR code

2944 bytes. Less than 0.006% of Wasmtime, smaller than a C “Hello, world!”.

Zero dependencies, no cheating: just a static x86-64 Linux executable. Scan the QR code above with zbarimg --raw -Sbinary or another QR decoder that supports binary data, or directly download the program from the GitHub repo, and you’re good to go.